Alembic 1.7.13 has been released

[Lucas Miller]

Thanks to your feedback and many issues submitted as well as a few
pull requests we have several bug fixes.

API:

Ogawa: Google generously setup AutoFuzz and it found several issues
when reading maliciously created files.

These reported issues are fixed:
253-258, 269-272, 282, 283 (PR266)

Maya:

AbcImport: Add support for connecting MFnData::kFloatArray. (PR251)

Build:

Fix issue where WFObjConvert headers were being put in the wrong place
when installed. (Issue 264)

Partly address Issue 265 by making some adjustments to the Doxyfile
and remove a very old reference to MD5Hash in the very old Houdini
SOP.

Partly address issues outline in PR268, use MSVC instead of Windows
variable as they are Visual Studio specific flags and define
-Wno-error=implicit-fallthrough for CLANG and GCC 7 and up.